qt quick with opengl underlay

[wysota]

Yes, call the function.

And you shouldn't access any of the window's properties from the rendering thread. Better initialize that scene before you start drawing.

[sajis997]

Thanks,

I have managed to render an opengl scene under the qt quick scene. I largely followed the tutorial titled - "Scene Graph - OpenGL Under QML"


Now i want to animate the opengl scene that contains a teapot. I usually rotate the opengl scene using the Qt' s timer event and timer function as follows:

QTimer *timer = new QTimer(this);
    connect(timer,SIGNAL(timeout()),this,SLOT(updateScene()));
    timer->start();

QTimer *timer = new QTimer(this);
    connect(timer,SIGNAL(timeout()),this,SLOT(updateScene()));
    timer->start();

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And inside the updateScene() slot I have the following :

void GLWindow::updateScene()
{
    float t = mTime.elapsed() * 0.001;
 
    mScene->update(t);
 
    paintGL();
}

void GLWindow::updateScene()
{
    float t = mTime.elapsed() * 0.001;

    mScene->update(t);

    paintGL();
}

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I used the same mechanism while integrating qt quick with opengl underlay, but the teapot only rotates for a while with the mouse click and it stops. I want the teapot to rotate continuously untill the application closes.

Any hint to achieve this ?

Thanks

[wysota]

You have to tell QtQuick scene to update itself. It will call your GL code with the beforeRendering signal.

[sajis997]

Thanks !

Any concrete example to what you have just mentioned ?

[wysota]

QQuickWindow::update().